To manage currency settings you need to go to Classified Settings > Currency Settings Module.
Here you get a form for setting your currency.
Name: Name of the currency.
System: Symbol of the currency.
Code: Code of the currency.
Currency Position: Position of the currency symbol. It may be after and before the amount.
Thousand Separator: Seperator of the thousand amount
Decimal Separator: Separator of decimal numbers.
Number of Decimals: Number of decimal number values to display